Skins not Icons

I was recently thinking, why do we only get icons from doing these "fun" gamemodes. What I mean is, why not give people skins if they acheive a level or mastery of the gamemode, like if in urf, if you could get a special skin for getting 500 kills or something, not easy, but possible. I would love to have something like this implemented. I personally enjoy the icons, doesn't mean I want to replace them, only add skins. (Dont really know what board to put this on, so champion skin concepts it is)